California Code, Education Code - EDC § 82321

A schoolbus is any motor vehicle designed, used, or maintained for the transportation of any school pupil at or below the 12th-grade level to or from a public or private school or to or from public or private school activities.

The governing board of a district maintaining a community college may, by resolution, designate any motor vehicle operated by or for the district, a schoolbus within the meaning of this section, if it is primarily used for the transportation of community college students to or from a public community college or to or from public community college activities.  The designation shall not be effective until written notification thereof has been filed with the Department of the California Highway Patrol.